LM2759

June 10, 2010

Compatible Interface

General Description

LM2759 is an integrated low-noise, high-current switched ca-

pacitor DC/DC converter with a regulated current source. The

device requires only four small ceramic capacitors making the

1 mm. The LM2759 is capable of driving loads up to 1A from

a single-cell Li-Ion battery. Maximum efficiency is achieved

over the input voltage range by actively selecting the proper

gain based on the LED forward voltage and current require-

ments.

compatible interface, along with eight selectable Flash Time-

Out durations. One high-current Flash LED can be driven

either in a high-power Flash mode or a low-power Torch

mode. The Strobe pin allows the flash to be toggled via a

Flash enable signal from a camera module. The TX input pin

limits the Flash LED current to the Torch current level during

a RF PA pulse, to reduce high loads on the battery. Internal

soft-start circuitry limits the amount of inrush current during

start-up.

LM2759 is offered in a small 12-pin thermally enhanced LLP

package.

Features

Amplifier Pulse

Applications

Typical Application Circuit

30069301

30069322

© 2010 National Semiconductor Corporation

300693

www.national.com